Web Callback account and instructions to connect any fixed/mobile line to another fixed/mobile line around the globe. Specify any 2 numbers to be connected and they will be connected within 30 seconds or so. We suggest to use when your internet mobile connection is very slow or has poor Quality of Service. You would need to load a simple web page "telefonoatelefono.com" to trigger the call back. After that the call will not use any internet data so the quality will be excellent.